Well I take a big lesson from this. I do USL work only occasionally. I would of course avoid buildings / people on the ground. But I'm sure I have flown across a road with a load on before now, and I suspect it might not have occurred to me to consider an aerial cable carrying a gondola as "people to be avoided".
Question for guys who do this sort of work (USL liquid concrete) routinely: do you keep the hook live, or switch the cargo master off for the short transit element of the flight?
Never stop learning
Sven